Motor and lubricating system therefor



De- 15, 1935- c. w. MAPI-:s ET A1.

MOTOR AND LUBRICATING SYSTEM THEREFOR Original Filed June l2, 1933INVENTORS ATTORNEYS Patented Dec. 15, 1936 UNITED STATES PATENT OFFICEMOTOR AND LUBRICATING SYSTEM THEREFOR Original application June 12,1933, Serial No.

675,456. Divided and this application February 18, 1935, Serial No.7,080

` 4 Claims.

This invention relates to a motor, and more particularly toa motorhaving a vertical axis of rotation.

The motor shown and described herein has been developed to beparticularly adapted as a high speed driving means for a device utilizedin the processing of textile materials. However, the various featuresthereof, such as those that contribute to the efficient operation anddurability of the device, as well as the smooth operation withoutharmful effects from vibration are deemed to be fully applicable toother motors. That is, a motor made to fulfill the conditions ofdurability and freedom from harmful effects of vibration at very highspeeds will also be quite satisfactory at lower speeds, although theconverse is not necessarily true.

An object of this invention is to provide a high speed driving means fora device utilized in the processing of textile material.

Another object of this invention is to provide a durable motor having avertical axis of rotation, which motor is adapted to operate above thecritical speed thereof without excessive vibration; the term criticalspeed being used to designate that speed above which the rotary partstend to rotate about their center of mass and a speed at which a maximumof vibration occurs.

Another object of this invention is to provide a high speed drivingmeans for a device having a vertical axis of rotation, which drivingmeans tends to balance the mass above it along the axis o-f rotation andto minimize the effects of an unbalance.

Another object of this invention is to provide a motor adapted tooperate at high speed, and having a substantially vertical rotary shaft,which shaft and its bearings support the mass of the device being drivenby the motor.

This application is a division of our eopending application Serial No.675,456, filed June l2, 1933.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to theaccompanysleeve I4 supported thereby and preferably inte- -grally formedtherewith, and has a base portion I6 that has a substantially conicalouter surface I8. Also preferably integrally formed with the base I2 isa projecting portion 20, preferably havin g a pO-rtion 22 that surroundsa portion of the surface I8 and is spaced therefrom, so that itoverhangs the base portion I6. The interior of the base I2 is hollowedout to provide a lubricant chamber 24, which lubricant chamber opensinto the interior of the bearing support sleeve I4. A suitable oiler orwell 26 is mounted in an aperture 28 in the wall of the base I2, whichaperture communicates with the lubricant chamber 24, so that lubricantmay be introduced into the chamber therethrough.

An anti-friction bearing 30 is mounted Within the bearing support sleeveI4, preferably near the end thereof that is adjacent the lubricantchamber 24, and is supported by a ledge portion 32 on the inner wall ofthe sleeve I4, preferably through a ring member 34. A portion 36 of theinner Wall of the sleeve I4 is preferably machined to fit snugly theouter surface of the bearing. A portion 38 of the inner surface of thesleeve I4, at or near the other end thereof, is preferably machined to tthe outer surface of another anti-friction bearing 4D. The shaft 42,extending substantially coaxially with the bearing support sleeve I4, isrotatably mounted in the bearings 30 and 40. A sleeve or spacer 44 fitsthe outer surface of the shaft 42 intermediate the bearings 30 and 40,and provides a support through which the bearing 40 is supported. A lookring 46 ts in a groove 48 inthe shaft 42, and a ring or Washer 50 isintermediate the lock ring 46 and the bearing 3l). An oil throwing ringor collar member 52 has threads on the outer surface thereof as at 54,and fits onto the shaft intermediate the bearing 40 and a ring or collarmember 58 that is secured to'the shaft or integrally formed thereon, androtates with the shaft to prevent lubricant from passing out of an openend 56 of the sleeve I4 and into the motor.

An end portion 60 of the shaft, preferably of smaller diameter than theremainder of the shaft, extends into the lubricant chamber 24 to a pointbelow the normal lubricant level therein, which level is preferablyapproximately that indicated at 62. An axially extending opening 64 inthe shaft provides a lubricant conveying passage therethrough, andcommunicates with cross or transverse openings 66 in the shaft above thebearing 40. A portion of the oil throwing ring QI 901124 member`52 iscut away as at 68 to permit lubricant from the passages 66 to pass tothe bearing 40. Centrifugal force imparted to the air and lubricantWithin the passages 64 and 66 causes the flow of lubricant through thosepassages to the bearing 40. The excess lubricant in the bearing 40precipitates through the space intermediate the sleeve 44 and bearingsupport sleeve I4 to lubricate the bearing 30. Lubricant vapor and sprayfrom the lubricant chamber 24 also aids in the lubrication of thebearing 30.

In order to prevent the centrifugal force imparted to the lubricant bythe end portion 60 of the shaft from tending to strongly prevent thelubricant from entering the passage 64, a tubular member 10, preferablyhaving an opening therein of substantially the same size passage 64, andhaving a conical tip portion T2, is mounted in the end portion 60 of theshaft so that the tip portion 12 projects from the end of the shaft. Thetubular member 'l0 and tip portion '|2 are coaxial with the shaft andthe inner surface of the tip portion '12 is also preferably conical soas to tend to prevent lubricant that has entered the passage 64 frompassing back out.

A member 14 extends through an aperture 16 in the bottom of the baseportion I6 and has a threaded portion 18 that is threaded into thebottom of the base portion I6 to secure the member in place. A headportion 80 on the end of the member 14 ts into a recess 82 in the bottomof the base portion |6 and has a slot 86 therein to facilitate removalof the member. A Washer or gasket 84 is preferably intermediate the headportion 80 and the surface of the recess 82 to prevent the leakage oflubricant around the member '|4. The member 14 is preferably coaxialwith the shaft 42, and has a tubular or sleeve portion 88 that surroundsthe end portion 60 of the shaft and extends to a point above the normallubricant level in the chamber 24. Apertures 80 are provided in thetubular or sleeve portion 88, preferably below the level of the end ofthe tip portion 12, to permit the passage of lubricant from the chamber24 to within the portion 88. Packing 82 of felt or similar suitablematerial is placed inside the tubular portion 88 intermediate theapertures 98 and the tip 12, and that packing is preferably retained inplace and away from the tip 'l2 by a substantially cup-shaped member 84that its into the tubular portion 88 and has openings 96 therein topermit the passage of lubricant.

A stator |00, having windings |02 and a core |04, is mounted on andsecured to the outer surface cf the support sleeve E4. The core |04 hasan opening |06 therethrough, and is mounted so that the sleeve i4 ispressed into that opening with a thin sleeve member |08 intermediate thecore |04 and sleeve I4. The core is located by a ledge portion H0 on theouter surface of the sleeve I4 and is additionally held in position by alocking ring l i2 that fits into a groove i I4 in the outer surface ofthe sleeve I4. It is also additionally held against rotary movement withrespect to the sleeve |4 by a deformed portion |16 of the sleeve 88 thatprojects into a recess ||8 in the slee'l e i4. A rotor 520 is preferablyof the squirrel cage type, and has a hollow core |22, conductor bars 24and end rings |26. The rotor l2@ surrounds the stator |00 and is incooperative magnetic relation therewith.

A member comprising a bucket or bowl portion |38 and a skirt portion |32is secured to the shaft 112 by screws |34 that have cooperating washers|36 that extend through apertures |38 in the member |28 into threadedapertures |40 in the ring member 58. The skirt portion |32 surrounds therotor |20 and extends into close relation with a flange portion |42 thatis preferably integrally formed with the base I2 and has a. portion |44that projects into the skirt portion |32 to form a substantial enclosurefor the motor. i

An inner surface |46 of the skirt portion |32 is preferably a machinedsurface which fits snugly the outer surface of the rotor |20. The rotor|20 is drivingly secured to the skirt |32 by set screws |48 or othersuitable fastening means. While the particular form of motor shownembodies the bowl or bucket portion |30 which is particularly adapted tothe processing of textile materials, it is understood that other typesof motors, or motors for other purposes, may well come within the spiritand scope of the present invention.

Electrical connections to the stator windings |02 are made through asuitable connecting cable |50. The cable |50 enters the motor through anaperture |62 in the base I2, which aperture preferably has a threadedportion |60 and a tapered portion |58. The cable |50 is preferablyanchored to the base I2 by a deformable annular member I56, of rubber orother suitable material, that is located in the tapered portion |58 ofthe aperture |62 and is urged into gripping engagement with the cable|50 by a screw |52 that is threaded into the threaded portion |60 andhas a. cooperating washer |54 intermediate it and the deformable member|56.

The motor is supported by support member |64 having a conical innersurface |66 through a resilient member |68 that ts the conical surfacesof the support member |64 and the base portion |6 and is disposedintermediate those surfaces. The resilient member |68 preferably hasprojecting portions |10 and |`|2 that project into recesses |14 and |16in thevbase portion I6 and support |64, respectively, to locate themotor and prevent circumferential movement thereof with respect to thesupport. The support |64 has a flange member |18 preferably integrallyformed thereon for securing the support to a suitable mounting bracket|80 by a bolt |82 that extends through cooperating apertures |84 and |86in the flange member and bracket respectively, and has a cooperating nut|88 and wash er |80.

With particular reference to Fig. 2, reference numerals similar to thosepreviously used refer to similar parts that perform similar functions.However, in this modification, a packing retaining member' 200 has asubstantially cylindrical wall 202 that fits into the tubular portion 88and a deformed central portion 204 that has a substantially cylindricalextension 206 that projects into the conical tip portion l2 to conveylubricant directly into the passage 64 through an aperture 208 therein.

With particular reference to Fig. 3, reference numerals similar to thosepreviously used, refer to similar parts which perform similar functions.In this modification, a packing retaining member 2|0 has substantiallycylindrical walls 2i2 that fit into the tubular portion 88 and a planeportion 2|4 that is preferably spaced from the packing 92, and has acooperating cylindrical portion 2 6 that projects into the tip 'l2 toconvey lubricant directly into the passage 64 through an aperture 2|8.

In the operation of this derice, the lubricant from thevreservoir 24passes through the apertures 90, and through the packing 92 and theapertures 96 into the tubular portion 88. The

density of the packing 92 controls the rate of flow of lubricanttherethrough as well as serving as a filter to remove any grit orforeign substance from the lubricant before it is carried to thebearings. The shaft of the motor is rotatably mounted in the bearings 30and 40 and the rotation thereof, particularly at high speeds, tends tocreate a reduced pressure in the passage 64 in the shaft, and impartcentrifugal force to the lubricant therein, which action conveyslubricant from within the tubular portion 88 through the passages 64 and66 to the bearing 40. The threaded portion 54 of the oil throwing ringor member 52 is closely associated with the inner surface 38 of thcbearing support sleeve I4, and prevents lubricant from entering themotor parts outside the sleeve I 4. The excess lubricant from thebearing 40 passes through the space intermediate the sleeve or spacer 44and the bearing support sleeve I4 to the bearing 30. Lubricant vapor andspray from the lubricant chamber 24 also aids in the lubrication of thebearing 30. Additional lubricant is supplied to the chamber 24 throughthe oiler 26.

In the construction of this device, the member I4 is preferablyremovably supported by the base portion |6 through the aperture I6 sothat it thereby acts as a drain plug as well as acting as a part of thelubricant control and filter for the device. The amount and type ofpacking 92 used within the tubular portion 98 determines the flow oflubricant therethrough and the quality of filtration of the lubricant.

In the assembly of the device, the oil throwing ring or collar 52 is putonto the shaft adjacent the ring member 58, which is secured to theshaft preferably by being integral therewith. The bearing 40, sleeve 44,bearing 30 and washer 50 are mounted on the shaft in the order given,and held thereon by the locking ring 46 that ts into the groove 48 onthe shaft. The member |28 is secured to the shaft 42 by the screws |34,and the assembly thus formed is mounted in the base I2 so that thebearings 30 and 40 engage the surfaces 36 and 38 respectively, of thebearing support sleeve I4.

The stator core |04 is preferably assembled on y a sleeve |08, and ispreferably held together by that sleeve, by rolling or riveting the endsthereof. After the windings |02 are wound on the core |04 it is thenpressed over the sleeve I4, and a portion I I6 of the sleeve deformedinto a recess ||8 to prevent any rotation of the core |04 relative tothe sleeve I4. The locking ring I|2 and ledge portion ||0 locate thecore |04 and prevent axial movement thereof.

The hollow rotor |22 is mounted within the skirt portion |32 so that itis magnetically associated with the stator |00', and is drivinglyconnected to the skirt portion by the set screws |48. The shaft 42 andskirt portion |32 are driven by the rotor |20; and the rotor, by Avirtueof its position, tends to balance the bucket or bowl portion |30 andlower the center of gravity of the rotating parts in the device.Furthermore, because the rotor is balanced and has considerable massthat adds to that of the driven member, the percentage of unbalance isminimized, whereby better and more stable operations are effected whichbecome increasingly important at .higher speeds. This feature isfurthered in the present design, because a greater mass can be put intoless space where the rotor is outside of, and rotates around the stator.

In the modified forms shown in Figs. 2 and -3, the lubricant is conveyeddirectly into the tip portion 'I2 by the cylindrical extension on thepacking containing member. The lubricant level outside the tubularportion 88 provides a head that tends to equalize the levels inside andoutside of the tubular portion, thereby induces the lubricant to flowthrough the packing and packing containing member into the passage 64.The cylindrical portion being inside of the tip I2 also reduces thespace through which lubricant may pass back out of the tip 12, andconsequently aids in preventing the lubricant from passing out of thepassage 64 in that manner.

Since the present motor is designed to withstand and operate at highrotary speeds, and particularly speeds above the critical speed wherethe rotary parts tend to rotate about their center of mass, rather thantheir geometric center, it is preferable that all of the rotary partsare concentric as well as perfectly balanced. It is also particularlyimportant that the normal running speed is not an integral multiple ofthe critical speed. The magnetic linkage between the rotor and stator ofthe present motor, as it is arranged and designed, tends to stabilizethe rotary parts against vibration. To further reduce the effects ofvibration, the motor is preferably resiliently mounted to the base.

From the foregoing description of the construction and operation of thisinvention, it is apparent that in one of the principal aspects theinvention comprises a motor adapted to be operated at high speed andincluding a vertical shaft 42, a base member |2 having a bearing supportsleeve I4, bearings 30 and 40 within the sleeve I4 rotatably supportingthe shaft 42, ai motor stator |00 outside of the sleeve I4 and supportedthereby, a member |28 having an upwardly extending bucket portion |30and a downwardly extending skirt portion |32 secured to the shaft 42 sothat the skirt portion |32 surrounds the stator |00, said member |28being concentric with respect to the shaft 42 and balanced for rotationtherewith, and a rotor |20 mounted inside of the skirt portion |32 ofsaid member |28 and magnetically associated with the stator |00, saidrotor |20 being substantially balanced and thereby increasing thebalanced mass of the rotating parts of the device and lowering thecenter/of gravity thereof.

The advantages of this structure include the following:

(1) A motor is provided which operates satisfactorily and with stabilityat high speeds, and particularly speeds above the critical speed of therotating parts, without excessive vibration or harm therefrom.

(2) In this vertical motor having an upwardly extending rotating part,the stability is greatly improved by the increase of the balanced massbelow the upwardly extending portion without the use ofspecial andadditional counterwball ancing mass.

(3) By increasing the balanced mass of the rotating parts, the possiblepercentage of unbalance due to an out of balance portion of lthe ro`tating parts is reduced.

While the form of embodiment of the present invention as hereindisclosed, constitutes a preferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claimswhich follow.

What is claimed is as follows: l

1. In a device adapted to be electrically operated at high speed in theprocessing of textile material, the combination comprising, a verticalshaft, a base member having a bearing support sleeve, bearings Withinthe sleeve rotatably supporting the shaft, a motor stator outside of thesleeve and supported thereby, a member having an upwardly extendingbucket portion and a downwardly extending skirt portion secured to theshaft so that the skirt portion surrounds the stator, said member beingconcentric with respect to the shaft and balanced for rotationtherewith, and a rotor mounted inside of the skirt portion of saidmember and magnetically associated with the stator, said rotor beingsubstantially balanced and thereby increasing the balanced mass of therotating parts of the device and lowering the center of gravity thereof.

2. In a device for processing textile materials having a rotatablebucket adapted to be electrically driven at a high speed, a baseproviding an upwardly extending bearing support member, a bearingsupported by the bearing support member above the base, a shaftrotatably supported by the bearing, a motor stator supported by thebase, and a rotating bucket extending upwardly from the end of theshaft, said rotating bucket being concentric with the shaft and securedthereto for rotation therewith, said rotating bucket also having adownwardly extending portion surrounding the shaft and stator, and asubstantially balanced motor rotor secured to the downwardly extendingportion and magnetically associated with the stator, said rotor addingbalanced mass to the rotating bucket below the upwardly extendingportion thereof to make the device more stable and smooth in operationat high speed.

3. In a device having a rotatable bucket adapted to be electricallydriven at a high speed, a base providing a bearing support sleeve, abearing supported within the sleeve, a vertical shaft journaled in thebearing, a motor stator supported by the sleeve, and a rotating bucketsecured to the shaft and extending upwardly from the end thereof, saidrotating bucket part being concentric with the shaft, a. substantiallybalanced motor rotor secured to the rotating bucket part and surroundingthe stator, said rotor increasing the balanced mass so that theseparation of the center of mass from the geometric center oi therotating part due to an unbalance in the rotating part is minimized.

4. In a device having a rotatable part adapted to be driven at highspeeds, a base providing a tubular bearing support, a bearing supportedwithin the bearing support, a vertical shaft rotatably supported by thebearing, a motor stator supported by the base and surrounding the shaft,and a bucket secured to the shaft, and extending axially upward from theend of the shaft, said bucket being balanced for rotation with the shaftand substantially concentric therewith, a substantially balancedmotorrotor secured to the driven member and surrounding the stator, themass and distribution of mass of the drivenvrnember and rotor therebybeing such that the normal running speed, although above the criticalspeed, differs from an integral multiple of the critical speedK CLYDE W.MAPES. ZERBE C. BRADFORD.

